Daikin VRV IV+ Service Manual page 241

REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
INFORMATION
If non-return valve a is blocked:
▪
Discharge pressure will increase.
▪
Liquid pressure will drop
▪
R4T and R5T temperatures will rise.
▪
R3T and to R7T temperatures will be drastically lower compared to R4T and R5T.
Is the non-retune valve a blocked
Yes
No
INFORMATION
If non-return valve c is blocked:
▪
Discharge pressure will increase.
▪
Liquid pressure will drop.
▪
R4T and R5T temperatures will rise.
▪
R7T will be drastically lower compared to R3T, R4T and R5T.
Is the non-retune valve c blocked
Yes
No
NOTICE
Below check procedure will only be relevant if indoor units are in heating mode with
high load condition (Y4S and Y5S MUST be ON).
6 Force the indoor unit into heating mode with high load condition.
7 Check liquid pressure by a manifold on liquid stop valve.
8 Check suction pressure using the service monitoring tool or field setting mode
1-43. Make sure the refrigerant low pressure sensor is NOT faulty. See
"3.18.1 Checking procedures" [
Check R3T, R4T, R5T and R7T thermistor read-outs. Check thermistor read-outs
using the service monitoring tool. Make sure all thermistors are operating
normally. See "Checking
INFORMATION
If non-return valve b is blocked:
▪
Liquid pressure and also discharge pressure will increase.
▪
Suction pressure will drop.
▪
R3T, R4T and R5T temperatures will be drastically lower compared to R7T .
Is the non-retune valve b blocked
Yes
No
Action
Replace the non-return valve a, see
"3.6.2 Repair
Continue with the next step.
Action
Replace the non-return valve c, see
"3.6.2 Repair
Continue with the next step.
4
333].
4
procedures" [ 348].
Action
Replace the non-return valve b, see
"3.6.2 Repair
Continue with the next step.
3 Components
|
4
procedures" [ 242].
4
procedures" [ 242].
4
procedures" [ 242].
Service manual
241